Irreversible drying of carbonaceous fuels

Details Irreversible drying of carbonaceous fuels Irreversible drying of carbonaceous fuels

1994-11-25

1996-06-18

McAvoy, Ellen M.

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

44592, 44608, 44621, C10L 500

Patent

active

055273653

ABSTRACT:
The invention disclosed relates to a method for drying low-quality solid carbonaceous fuels such as lignite and sub-bituminous coal to reduce the moisture content substantially to zero, and to minimize re-adsorption of moisture during storage and transporation. The method involves drying the solid fuel in a mildly reducing atmosphere at a temperature in the range of 150.degree.to 300.degree. C., preferably 200.degree.to 210.degree. C. The mildly reducing atmosphere may be provided by a gaseous lower-alkane e.g. propane and methane. In some cases, the coal may beneficiated by agglomeration with small amounts of oil.

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patent: 5035721 (1991-07-01), Atherton
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